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From Mangaupdates:
Ichijo Kazuya thought that he was murdered, but when he came to, he was back in his high school days. He lived his entire life as a playboy and had had countless sexual encounters with women until that fateful day that he was killed. He realizes that his murderer was his old high school friend Tanaka Masaki who was jealous of Kazuya’s relationships and his built up anger eventually exploded. Taken back 15 years into his past, it seems that he has been given a second chance at life and given a chance to make different choices. He decides that the way to prevent his eventual demise is to make sure Masaki is more successful with girls and loses his virginity before Kazuya. But fate seems to be steering Kazuya towards the path of his previous life and keeps introducing the same girls he had sexual encounters with.

Spoiler for ch1-4:

I read the 1st four chapters and found this manga interesting. Basically, the main character Kazuya is killed by his old friend Masaki but finds himself back 15 years in the past in his high school years. Believing Masaki killed him due to anger and jealousy over Kazuya who became a successful and shameless playboy who slept with many girls while Masaki became a poor novelist assistant and remained a virgin, Kazuya sets to save his life in the future by changing the past to make sure Masaki gets a girlfriend and losing his virginity first.

Thanks to some brief memories he has of his past, Kazuya prevents and avoids certain events that made him into a playboy and tries to have Masaki hook up with his crush Rika Yoshino, which he never did in his old timeline.

Unfortunately there's a problem: Kazuya himself. Because Kazuya is a 32 year old in his teenage body in the past, he's much more level headed, smarter and mature. Furthermore, unlike his past self who was a douche who only went out with girls to have sex with them which included his female classmates, Kazuya is now more kind to the girls and treats them with respect. Ironically, the girls he had sex in the past like the mature and kind Kazuya including librarian Soutome and Rika! Basically, his attempts to help his friend backfire.

Of course, there are hints in the series that Masaki didn't kill Kazuya out of jealousy but something else. Chapter 4 includes a scene where Kazuya has a feelings something bad might happen to Rika. All and all, i can't wait to read more.

Of course, there are hints in the series that Masaki didn't kill Kazuya out of jealousy but something else. Chapter 4 includes a scene where Kazuya has a feelings something bad might happen to Rika. All and all, i can't wait to read more.

Dont worry it was a couple pages back. We all make mistakes I make very silly ones . BUt yea I love this manga and i think its going to be about how the MC changes his views on women and how they aren't just for pleasure but are people to. I think that in itself is interesting.

It looks like it ends up with Kazuya getting knocked out/killed, then sent back to his time in the future.

Just read the translated version. Kazuya did change the past slightly and he show us, he is no coward. I hope the last panel, where the senpai was rid of, does not happen often. I have a huge pet peeve against "plot situations" saving the protagonist all the time.

Another thing, Kazuya is still dreading about his friend murdering him over sexing up with other girls? Meh, I would drop him as a bud (yup, same old ranting).

Masaki's issue with Kazuya lies not with the fact that Kazuya lost his virginity before him. It's Kazuya's ability to attract people around him in front of Masaki. If you observe Masaki's behavior, the only guy hanging around with him is Kazuya. Even when they did that job with four people for the class, he looked pretty distant in the group.

I think the fact that Kazuya drifted away from Masaki in the years after high school (during that party in the flashback, he had that lonely expression) made Masaki go nuts as Kazuya was his final bond but even he vanished in his life.

While Kazuya is restoring his bonds and past mistakes, this will actually accelerate Masaki's frustration and jeaulousy with Kazuya.

Then won't it better for him to eliminate him?
If he knows that guy will kill him in the near future then all he needs to do is prepare himself...
Though some events could be altered, him getting beat up by that person seems destined to happened...
Though it only differs in place and time... and this time around, he didn't screw the girlfriend...

I think he'd be destined to fail if he tried to attempt to eliminate Masaki. Remember, Kazuya's life right now is simular to that of a galge game, the only way out towards the good end is to take the right choices.

This time however, the event will happen again with Masaki attempting to kill Kazuya but my guess is that Kazuya's strong link with his friends will be set in motion to prevent his death. Kazuya at that point will find out the root of the problem, send Masaki to a psychologist en lead a life with everyone happy.

Well the event of the story so far remind us of some Greek myths involving oracles and pips trying to change the said fate only to fulfill the prophesy and their fates kicking them in their ass...
What he is doing is the same as those character in the stories. Trying to alter their fate by changing the course of history ergo he'll die like the characters of the story...
If he can't eliminate him then he should just prepare himself like preparing food supply and such in an incoming storm...
So if the jerk tries to kill him, he is ready to defend himself and survive the said ordeal...